Last summer (June 2008) I wrote a post titled " ProShares ETFs - Why trading volume makes a difference ." Since then, there have been two situations that suggest it might be a good time to look at trading volume again: ProShares has created a half dozen new ETFs that weren't in our previous analysis and market conditions have taken a further turn for the worse with the S&P 500, for example, going from roughly 1325 to under 800. Below we present a table contrasting average daily volume in the year leading up to June 25, 2008 with average daily volume in the eight months since June 25, 2008. It is sorted in descending order based on the latest volume numbers. Symbol Name Avg Daily Volume prior to 6-25-08 Avg Daily Volume since 6-25-08 UYG Ultra Financials 3,778,258 112,176,547 SSO Ultra S&P500 2,368,347 56,212,929 SDS UltraShort S&P500 10,640,286 43,730,513 QID UltraShort QQQ 20,042,465 38,670,681 QLD Ultra QQQ 4,171,179 31,438,395 SKF UltraShort Financials 3,77